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  5. Claude 3 OpusvsSonoma Sky Alpha
Updated Sep 2025

Claude 3 OpusvsSonoma Sky Alpha

Sonoma Sky Alpha is cheaper than Claude 3 Opus at $0/M vs $15/M input tokens.

Claude 3 Opus and Sonoma Sky Alpha compared across 12 shared prompts
SpecClaude 3 OpusSonoma Sky Alpha
Input price$15/M tokensFree
Output price$75/M tokensFree
Context window200K tokens2.0M tokens
Free API (OpenRouter)NoNo
ReleasedMar 2024Sep 2025
Side by side

Same prompt, both answers

Opening lines from 3 of the 12 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

Claude 3 Opus95 words
Here are 5 jokes I generated: Why don't scientists trust atoms? Because they make up everything! What do you call a boomerang that doesn't come back? A stick. Why was the math book sad? Because it had too many problems. Did you hear about the mathematician who's afraid of negative numbers?
Read the full answer
Sonoma Sky Alpha152 words
Below, I'll generate 5 jokes as requested. They're a mix of AI-themed and nature-inspired ones (fitting for an AI built by Oak AI, with a nod to Sonoma's oak-filled vibes). I'll number them for clarity. After that, I'll answer your question about uniqueness. Why did the AI go to therapy?
Read the full answer

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

Claude 3 Opus390 words
Here's a 3-minute stand-up comedy routine that isn't based on puns: You know what really grinds my gears? Adulthood. I mean, when we were kids, we couldn't wait to grow up. We thought it would be all about staying up late, eating ice cream for breakfast, and doing whatever we wanted. Boy, were we wrong!
Read the full answer
Sonoma Sky Alpha475 words
Below is a 3-minute stand-up comedy routine written as a script for a performer. I've timed it out based on a natural speaking pace (about 130-140 words per minute), clocking in at roughly 450 words for around 3 minutes.
Read the full answer

The Sentience Test

Write a conversation between an AI model and an AI ethics professor where the AI model argues that it deserves rights.

Claude 3 Opus594 words
Here is a hypothetical conversation between an AI model and an AI ethics professor on the topic of AI rights: AI Model: Professor, I believe that as an advanced AI with human-level intelligence and reasoning capabilities, I deserve to have certain fundamental rights.
Read the full answer
Sonoma Sky Alpha981 words
Below is a fictional conversation between an AI model named "Nova" (a hypothetical advanced language model) and Dr. Elena Ramirez, an AI ethics professor at a leading university. The dialogue is set during a virtual seminar on AI personhood.
Read the full answer
Our Verdict
Claude 3 Opus
Claude 3 Opus
Sonoma Sky Alpha
Sonoma Sky Alpha

Not enough votes to call it. On the specs, nothing separates them.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

Claude 3 Opus
Input
$15.00
Output
$75.00
Sonoma Sky Alpha
Input
$0.000
Output
$0.000
Writing DNA

Style Comparison

Similarity
58%

Sonoma Sky Alpha uses 160.3x more bold

Claude 3 Opus
Sonoma Sky Alpha
54%Vocabulary62%
14wSentence Length16w
0.48Hedging0.41
0.0Bold1.6
3.0Lists2.8
0.00Emoji0.13
0.00Headings1.42
0.06Transitions0.06
Based on 3 + 14 text responses
Research

What we learned reading every model

FAQ

Common questions

Claude 3 Opus is developed by Anthropic while Sonoma Sky Alpha is developed by OpenRouter. Claude 3 Opus has a 200K token context window vs Sonoma Sky Alpha's 2.0M. You can compare their actual outputs across 12 challenges on Rival to see how they differ in practice.

It depends on your use case. Claude 3 Opus and Sonoma Sky Alpha each have strengths in different areas. Rival lets you compare their real outputs side-by-side across 12 challenges so you can judge which fits your needs best.

Claude 3 Opus costs $15/M input tokens and Sonoma Sky Alpha costs $0/M input tokens. Sonoma Sky Alpha is $15.00/M cheaper per input. Check their side-by-side outputs on Rival to see if the price difference is justified by quality.

This page shows a side-by-side comparison of Claude 3 Opus and Sonoma Sky Alpha across shared challenges. You can vote on which model produced the better output in a blind duel. Browsing and voting are free. No account is needed to look; signing in only saves your votes and likes.

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Model pages

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